Fuse



M. MATHSEN FUVsE Filed Jan. ll, 1935 Z'Sheets-She'et 1 I3 IZ Il Invent Url Marvin L MatI-LEETL Aug. 27, 1935. M. 1 MATHSEN FUSE Filed Jan. 11, 1935 2 Sheets-Sheet 2 f Inventur Marvin L Mathaen Patented Aug. 27, 1935 UNIT-ED s'm'ras y A FUSE Marvinf L. Mathsen, Rockaway, N. J.- Application January'11,1935g serial No. 1,3?.2

-QL f -7 claims.

'Y mechanisnfwhich carries' a firing pin and'is movablelongitudinally of. the fuse and by a novel mechanism.':f; v --zz'l'ofthesefand'other ends, the invention consists the construction, arrangement and combinavarrangement. for. controlling the clock-Work tior'rofelements described hereinafter and point- *A :practical l infv Y Sl=y Fig. 4l. is a longitudinal sectional View yof the 'fuse with the `parts in the safe position.

yf-FigfZ is avievvinV side'elevati'on Withparts'in `fuse'in the armed position.

,4 5.2'Y Y Y j Fig. '7is la'longitudinal sectional View of the section.

vifFigs'i 3 'and' 4' are sectional views on the corresponding lines of Fig. 1'. JFig'. 5 isa 'longitudinal sectional View of the VIFi'g. 6 isa sectional View on the line 6-6 of 'fuse when in rin'g position due to functioning of 'the' timingfunit.

4Figf'9 1isfa;longitudinal sectional View of the fuse when 'red on impact.

T.Fig'." l0 is a sectional View on the linev III- I0 of Fig'g Y .ffFi'gp-llis afdetail. sectional View showing'the farrriing'-b'olt l v Referriiigto the vdrawings by characters of -reference,the fuse comprises` a chamberedbody y Whose front endris closed by a head 5 havinga tubular portion I disposed Within the body and a .flan'ge extendingover'the rim ofthe body. vThe Yl'i'ead is slidablyfmounted Withv respect tothe body,

kitsui1-ivvard rvmovementbeing opposed by a ring 9 .fduredto the bodyby shear pins ID (Fig. 2) and its outward movement being restrained by pins I I threaded in' the body' aridY :normally disposed at Param Fries `(Grammi undef the act offivnrch 3, 1883, as

the inner end of blind slots l2 in the tubular` portionI. l if' A plurality of groups ofl blocks I3 each group carried by a spring I4, are interposed between the flange 8 of the head and the rim of the body and Whenin place preventinwar'd movement of the head. The blocks are Vconfined: against the tendency of their springsto throw them from the Vfuse by meansof a cap.I5 fitting overthe outer end of the head. 1 v

The cap is part of .a vane assembly which is removed from'the fuse during viiight and is carried by a'shaft I6, being retainedl betweeria col lar I 'I and a propeller 'or vane I8!v Thecap is held against rotation by a pin I9 extending' intotlie head 6. 'Ihe inner portion of the shaft'threa'd- K edly engages a nut which is housed `in are- 'cess in the head and has Vspaced flangesl 2I and ZZVWhereby it is rotatably Supported 'bya 'plate 23 secured tothe head by screws 24. f

' A gear Wheel 25 secured to theshaft l'and a gear Wheel 23 secured to the nut'201 and having v one moretooth than lthe gear25 areb'oth in mesh with apinion 21 mounted on ashaft 28"carriedlby the plate A23. 1 "f f. A timing unit 29 which is a conventional clockwork mechanism is slidably and rotatably mounted in the chambered body 5 and carries a ring pin which projects through an aperture 3| in the rear end of the body. The firing pin also extends into an aperture 32 in a base`33 Whichrotatably carries the body'by a two-partl retaining ring 34. The ring'pin is' slidable lin the 'aperivture "32 but is non-rotatably associated lvvithvthe Walls of the aperture by a non-circular shape. A spring 35 conned between'the base and a' collar 36 on the ring pin urges the firing pin rearwardly. s Y

The firing pin is normally restrainedvagainst the action of the springby a conventional arming bolt 3l (Fig. 11) which is-mounted in a passage 38 in the body and has a bifurcated inner end 39 straddling a round part 4D of the firing pin. The bolt is ejected from the fuse by a spring 4I when the usual arming wire 4l2 is Withdrawn during launching of the bombas is Well understood in the art. f

On the front or outer end ofthe timing unit 29 there is a guide pin '43 inserted in a recess 14 in the head. On the same end, a disc (Fig. 3) having a peripheralre'cess 46 is adaptedto be rotated when the timing unit is in operation. The disc carries a Hat-spring 4l having a nger a8 (Figs. 1, 3,V and 9) which extends `through an aperture 59 in the disc' and bearsfagainst a lug 50 through an aperture 58 in the head 6 and opposesv movement of the lever underthe action offithe spring 56. The front armof ,theleverisformed on the timing unit when the timing unitV is held by the arming bolt in its foremost position with the springipressed against the head 6. In this posi-v tion of the parts the disc is held against rotation and it is only free to rotate when the timing unit has been displaced and the spring, being thereby released, disengages its fingenfrom the lug 50.

The ring 9 is formed with a slot 5I forreceiving Y a timing lever 52 and a stop l'ever 53 respectively mounted on pivot pins 54 and 55 carried by the,

ring.v The timing lever is disposed longitudinally" of the fuse on theoutside of thetiming unit and'v its frontarm is normally urged towardsthe axis ofthe fuse by ay spring 56. the cap I5 and removable therewith extends with a lug 59 engaging the periphery iot-the'disc 45. The lever is thereby held against theaction f of the spring 56 until the recess 5467in the disc is l brought into line with the lug. One corner of the lug 5.9 also engagesth'efront edge ofthe timing Yur1it,wlen the latter is in the safe position shown in Fig. 1. K When the timing lever is thus held against f the action oi' the sprin'g'56fits rear 'armfis main.

.tained in engagement with the stop 1ever53 and holds kthe stopflever in a position radially'of the fuse with one arm interposedin the path of move- 'ment o! thertiming unit. The stop lever holds the timing unit'agninsmhe noti-on of tbespring 35.

after: theearmingbolt' 31 has been ejected.

The base 33 carriesga number of plungers v60 Figs. land 4'for frictionally'engaging the rear end 'of-the body5. `"'Iheibasezalsocarries a pin 6I '-which rides in a slot' 62 in the body and by engag- `fing-the ends ofthe slot 'preventssetting of the vThe `i',i1n'ingunit vbetween zero and 3 seconds. usual time scale .63.is inscribed on the-body and is lread by aY reference markV 64 on the base. The bodyrand baseare flockedagainst relative rota- Y :tional movement,` after .the timingfunitjis set, by

v 'isattachedrto the bomb 61. This has the effect Aof angularly displacing the timing lever 52 While means of a set screw'65, Whichin turn is held by a ilat spring 66. l n

- .l The fuse'is in the safe or unarmed positionwhen theV parts are arranged as Y shown inFig. 1 with ,the'armingbolt 31 in place and with the stop lever 53 in rear of the .timingunit The timing unit-is Set according to 'the-indication on 4thescale 63 by rotating the body'5 relativeto thebase 33 which .the timing unit including the disc With-.recess 46 is held stationaryby virtue of the non-circular 'engagement of the firing-pin in the base.V

Whenthe bomb isV launched, the armingvwirei 42 is withdrawn, the arming bolt 31 is ejected, the

timing unit is moved bythespring 35.,until arrested by Ythe stop lever 53, which movement is suicient to enable/.the spring 41 fto release the disc, andthe vane' I8 kcommences to rotate.` After anl'intervzatl'the vane has Unthreaded itself from the nut and falls clearvof theiuse carrying the cap` I5. The removal of the cap frees the blocks I3 'which are thrown'V out and also `withdraws theY pin 5l from engagement with thek `timing flever52; z p The disc 45 is being otatedby the timingv unit and after aninterval designated by thescale 63,

therecessf46 in the disc Yis brought into line'witl'i` the lug 59 on th'e timing lever 52 and the latter is 'moved'by Yits spring 56.-terme the' stop leverr53. The'timingunit and'lring' pin are now moved rearwardly to'ring positionby the spring 35 as A pin 51 carried byl spring'heldinA engaging position by and non-rotatably associated .with theebang-af ment of the timing unit.v 1

tinnng una mounted for, iongitudinal movement side.

If impact occurs. beforeY the timing unit hasV functioned as justdescribed, the head 6 is'driven rearwardly and carries with it the ring 9 whose *shear vpins I0 are severed. The timing andstop levers mounted in theV ring areaccordingly dis-V,

placed and the hood drives the timing una and firing pin'A into the iiring-position as s hovvnin ."Iclaim: Y Y

l. In a fuse, a. base, a body rotatably mounted on the basa-ahead sndabiy mounted on the ,i

a mgieieasobiy attached to the body and normally @Poging-,inward movement` o! the head,`ul 15 timing" unit slidable within the ring, a firing pin carried by' the timing unitarid 'non-rotatably associated with thefbase, a spring'ior movingthe ring pin to fired position, a removable bolt nor-Y mally holding 'the' ring pin against the action of the spring; a rotatoria4 mscgrormigiponor yspring leai'rfiedby discandl m8281118? the lil Aing.` unit to hold the is the 'bclt '151111 Place, 1a ltuning .levano-mod 133mg rin: and riding on the periphery ottime' a stop leverjc'arriedjby thefringlsnelheid:byline.l

timing lever in the pathof movement 15h V2*. a'fmse, albase, a

onthelbase, a head mounted onv thebody,

ing Vunit Slidable thefhody'yafnrkigdia -carried, by the tirrili'jig'unitV andV associated with, the base, 'a spring forv lpin to. fired position; a :removable'bolt-'mrmally' holding-the riixpin peti@V A Vfol! thespring, a rotatable discforminggpartsaf f thetimingunit andhaving a peripheral recoga spring carried by the discand engaging thetiming" K una' to h'oid tnediso: against Nrotation, said .spring hoidinengaging posmonvbyrne n bolt is in place, a timing lever'carried by the body'2 andridin'g on the';periphery.ot Athe disc, and av u. timing :leverinthe path ot movmmt of thetim-V, v,

stop levercarried by the and l a- In arme, nime-a; bodyrotoc'omefnn spect to Vthelbasa'a timingznnitslidabler'ithh the body,v a ming pin oamodby the timing-.izmir Y4. Ina` fuse, ibase, a Y spect tothe base, "a timing :unit "slidablewithil 1 th body, aniing pincrried by ythe timing unit f.

and non-rotatably associated with the base',V fi

spring'i'or moving 'the'tlringjpin tofiired positbn, A

a rotatable disc forming Vpart of thegtimlngjmit andhaving a peripheral recess, anda tim/ing ley@Y .i j riding on the' periphery 0f. the ling movement of the timing unit undertheactioa in thebody, a spring Iormpving'saidjunit', a'statfing control member for said'unit movable Ldunng' night for normouy holding vche?A timingiunit with-the control memberlin inopei' "ative position the head, tuxlimit I shown` in Fig. '7, the stop lever being rotated to one Y Y ing movement of the timing unit, and means under control of the timing unit for inoperating the limiting means.

6. In a. fuse, a body, a head on the body, a tim- V-ing unit mounted for longitudinal movement in the body, a spring fory moving said unit, apstartv ing control member for said unit and means removable during ilight for normally holding the timing unit with the control member in inoperative position against the head.

' ing unit against the action of the spring, and

means operable on impact for displacing the timing unit and time control means.

MARVIN L. MATHSEN. 

